Best Indoor Strains: 5 Strains That Suit an Indoor Grow

Leafly's grow profiles rate strains on difficulty, height, yield and flowering time, and those are the traits that count in a tent or grow room, where space and time are limited. Indoors, 2 more traits matter: how easily the buds trim, and how a strain copes with humidity, because damp air invites mould. The 5 strains below have grow notes that suit indoor growing, followed by 2 popular strains that are harder to grow inside.

Northern Lights, or NL, is an indica from Afghani and Thai, and Leafly says growers find it grows best indoors, with purple, crystal-coated buds and a flowering time of 45 to 50 days. Leafly calls it one of the most famous strains of all time, cherished for resinous buds, fast flowering and resilience during growth. Its high calyx-to-leaf ratio makes for easy trimming, it grows best as a multi-branch plant, and yields typically fall between 400 and 500 g/m². It is also a parent of Super Silver Haze and Shiva Skunk.

Granddaddy Purple gives growers massive yields that are ready for harvest after about 60 days of flowering indoors, according to Leafly. Its grow notes call for good air circulation, clearing lower branches to improve air flow, and temperatures of 21 to 27°C at about 50% humidity. The deep purple buds carry a grape and berry aroma. See the Granddaddy Purple strain profile.

GG4, also known as Original Glue, is described by Leafly as a fast-growing strain that produces large yields of sticky buds after 9 to 10 weeks of flowering. Leafly rates it moderate to grow, with a high yield and short to average height, which suits rooms with limited headroom. Bred by GG Strains, it won first place at the Michigan and Los Angeles Cannabis Cups in 2014. Read the Original Glue (GG4) profile.

Kosher Kush, an OG Kush relative that originated in Los Angeles as a clone-only strain, has grow notes that list yields of 450 to 550 g/m², tolerance for moderate to heavy feeding and easy trimming. It won Best Indica at the High Times Cannabis Cup in 2010 and 2011. More in the Kosher Kush strain profile.

Bubba Kush has a stocky plant stature and bulky buds, and Leafly's grow notes say it is well suited to sea of green, a method that fills a space with many small plants, with yields of up to 430 g/m². It can show many different indica phenotypes, so plants from seed may vary. See the Bubba Kush strain profile.

Gelato is rated hard to grow, with a medium yield, short to medium height and 8 to 9 weeks of flowering. Blue Dream flowers in about 67 days on average, but Leafly notes it is susceptible to powdery mildew and spider mites and can stretch during flowering, so it needs room and close attention; the Blue Dream strain profile has more on the strain itself.

Under federal law, adults can grow up to 4 cannabis plants per household, not per person, subject to provincial, territorial and municipal rules. Quebec bans home growing. Manitoba has allowed it since May 1, 2025, for adults 19 and older, with up to 4 plants per household, and the plants must be grown indoors.

For indoor setups, Health Canada advises ventilating the grow area well enough to remove extra moisture and humidity, which helps prevent mould on plants and in your home. It suggests limiting odours with filters or gels, speaking to a professional before changing your home's structure or electrical system, and notes that no pesticides are registered specifically for cannabis grown at home. This beginner's guide to growing at home covers the basics.

Look for lab-tested flower with clear THC and CBD numbers, and buds that look and smell fresh. The GasDank menu carries lab-tested products, its flower comes from small-batch growers, every batch is checked before it goes on the menu, and flower is kept in UV-protected jars until it is packed. Menus change, so the flower menu shows what is on it right now. Delivery is same day across Toronto and the GTA, usually within 1 to 2 hours, with mail order across Canada. Customers must be 19 or older (21 in Quebec), and ID is checked.